Year	US Dollars adjusted for inflation)
1991	12752.918
1992	13487.944
1993	14315.611
1994	15213.732
1995	16270.586
1996	17274.385
1997	17973.068
1998	16176.49
1999	16693.797
2000	17574.311
2001	17286.844
2002	17732.221
2003	18284.615
2004	18993.566
2005	19464.848
2006	20057.242
2007	21464.926
2008	21860.512
2009	20759.504
2010	21571.959
2011	21665.629
2012	21877.668
2013	21825.789
2014	22417.953
2015	22964.426
2016	23555.629
2017	24524.607
2018	25372.957
2019	26106.545
2020	26767.229
2021	27433.879
2022	28120.969